[FS#362] WR1043ND v4 Slow WAN -> LAN Whilst Synced @100Mbps

[LEDE Bugs]

The following task has a new comment added:

FS#362 - WR1043ND v4 Slow WAN -> LAN Whilst Synced @100Mbps
User who did this - SpiderVice (Spider-Vice)

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I didn't iperf, but I attempted a file copy between two local clients and this works normally. My issue is restricted to WAN to/from LAN connections. The issue is not present in the stock firmware, it's not a cable issue.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=362#comment2404